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<div class="section" id="image-file-window">
<span id="index-0"></span><span id="id1"></span><h1>Image file (window)<a class="headerlink" href="#image-file-window" title="Permalink to this headline">¶</a></h1>
<p>This preview window is used to display the content of an external image file.</p>
<div class="section" id="activating-the-dialog">
<h2>Activating the dialog<a class="headerlink" href="#activating-the-dialog" title="Permalink to this headline">¶</a></h2>
<p>The dialog can be activated:</p>
<ol class="arabic simple">
<li>from the main menu: <em class="menuselection">Tools ‣ Open file</em>.</li>
</ol>
<p>When a file is opened, the program checks its content and decides which kind of
preview window will be activated. Each file is presented in a separate window.</p>
</div>
<div class="section" id="dialog-controls">
<h2>Dialog controls<a class="headerlink" href="#dialog-controls" title="Permalink to this headline">¶</a></h2>
<div class="figure align-center">
<img alt="CCD image file preview" src="_images/ccdfile_couts1.png" />
<p class="caption">Preview window for CCD image files</p>
</div>
<p>(1) The CCD image is displayed in the preview area. It is possible to switch between
positive and negative style in the “Preferences” dialog.</p>
<p>(2) When you place a cursor over an image, the coordinates and the pixel value
is displayed in the status bar.</p>
<p>(3) You can zoom the preview in and out by means of the zoom icons on the toolbar.
The actual magnification is shown here.</p>
<p>(4) The local menu bar provides following functions:</p>
<ul class="simple">
<li>Menu File:<ul>
<li>Show properties - display the further details about the file. Full header preview
is available in separate window.</li>
<li>Close - close this window</li>
</ul>
</li>
<li>Menu View:<ul>
<li>Pseudo-color scale - switch between rendering of pixel intensities in pseudo-color scale and a gray scale.</li>
<li>Bad pixels - turn on and off the highlighting of pixels on the intensity limits or outside the limits
The limits are set up the “Preferences” dialog.</li>
</ul>
</li>
<li>Menu Tools:<ul>
<li>Gray scale - show a gray scale or a pseudo-color scale on the right side of the dialog.</li>
<li>Quick photometry - show the Quick photometry tool - explained below.</li>
<li>Profile - show the Profile tool - explained below.</li>
<li>Histogram - show the histogram and statistics.</li>
</ul>
</li>
</ul>
</div>
<div class="section" id="quick-photometry-tool">
<span id="index-1"></span><h2>Quick Photometry tool<a class="headerlink" href="#quick-photometry-tool" title="Permalink to this headline">¶</a></h2>
<p>The Quick Photometry tool is a tool which computes basic photometric properties
of an object on a frame. The main goal of this tool is to provide an estimation of
the FWHM value (the important input parameter of the photometry process).</p>
<p>Because this tool does simplified version of aperture photometry, the results
are informative only and shouldn’t be used elsewhere. Also, it doesn’t require a proper
calibration to be performed first.</p>
<p>To activate the tool, select <em class="menuselection">Tools ‣ Quick photometry</em>
from the local menu. A new panel on the right side of the preview window appears.</p>
<div class="figure align-center">
<img alt="Quick photometry tool" src="_images/preview_couts3.png" />
<p class="caption">Quick photometry tool</p>
</div>
<p>Using the left mouse button, click on the image (1), close to an object. The program
automatically finds the nearest local maximum, so you don’t need to be accurate. The computation
stars automatically and the results are displayed the the right panel (2).</p>
<p>The following object parameters are presented:</p>
<ul class="simple">
<li>Center - coordinates of the local maximum.</li>
<li>Max - pixel value in local maximum</li>
<li>Background - mean background level, computed as a robust mean of pixels in the sky annulus.</li>
<li>Noise - background noise level, computed as a standard deviation of pixels in the sky annulus.</li>
<li>FWHM - object’s width, computed full width at half maximum.</li>
<li>Aperture - aperture radius used for computing the object’s signal.</li>
<li>Signal - object’s signal, sum of pixels in the aperture, mean background level is subtracted.</li>
<li>S/N ratio - signal to background noise ratio, displayed in decibels: SNR = 10.log(S/N).</li>
<li>(3) Several dimensions are presented in the image area.</li>
<li>Two blue circles show the annulus which is used to estimate the background properties.</li>
<li>A red circle shows the object’s average FWHM.</li>
<li>A green circle shows the size of the aperture.</li>
</ul>
<p>It is also possible to change some parameters:</p>
<ul class="simple">
<li>(4) Aperture radius in pixels</li>
<li>(5) Inner radius of the sky annulus in pixels</li>
<li>(6) Outer radius of the sky annulus in pixels</li>
</ul>
</div>
<div class="section" id="profile-tool">
<span id="index-2"></span><h2>Profile tool<a class="headerlink" href="#profile-tool" title="Permalink to this headline">¶</a></h2>
<p>The Profile tool is used to check the shape of objects. It shows
a curve of pixels values along a line.</p>
<p>To activate the tool, select <em class="menuselection">Tools ‣ Quick photometry</em>
from the local menu. A new panel on the bottom of the preview window appears.</p>
<div class="figure align-center">
<img alt="Profile tool" src="_images/preview_couts2.png" />
<p class="caption">Profile tool</p>
</div>
<p>Using the left mouse button, draw a line on the image (1), crossing the center of an object.
The profile is drawn in the graph (2). You can adjust the graph style (3). The following parameters
are displayed in the information box (4):</p>
<ul class="simple">
<li>Min - minimum pixel value.</li>
<li>Max - maximum pixel value</li>
<li>Mean - mean pixel value of pixels in the profile.</li>
<li>St. dev. - standard deviation of pixels in the profile.</li>
</ul>
</div>
<div class="section" id="histogram-tool">
<span id="index-3"></span><h2>Histogram tool<a class="headerlink" href="#histogram-tool" title="Permalink to this headline">¶</a></h2>
<p>The Histogram tool shows a histogram of pixel values and some related
statistics.</p>
<p>To activate the tool, select <em class="menuselection">Tools ‣ Histogram</em>
from the local menu. A new panel on the bottom of the preview window appears.</p>
<div class="figure align-center">
<img alt="Histogram tool" src="_images/preview_couts4.png" />
<p class="caption">Histogram tool</p>
</div>
<p>The histogram is shown in the left part (1) of the tool. The following parameters
are displayed in the text area on its right side (2):</p>
<ul class="simple">
<li>Min - minimum pixel value</li>
<li>Max - maximum pixel value</li>
<li>Mean - mean pixel value of all pixels</li>
<li>St. dev. - standard deviation of all pixels</li>
</ul>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><a class="reference internal" href="open_file_dialog.html#open-file-dialog"><em>Open file (dialog)</em></a></p>
</div>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Image file (window)</a><ul>
<li><a class="reference internal" href="#activating-the-dialog">Activating the dialog</a></li>
<li><a class="reference internal" href="#dialog-controls">Dialog controls</a></li>
<li><a class="reference internal" href="#quick-photometry-tool">Quick Photometry tool</a></li>
<li><a class="reference internal" href="#profile-tool">Profile tool</a></li>
<li><a class="reference internal" href="#histogram-tool">Histogram tool</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
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title="previous chapter">Heliocentric correction (dialog)</a></p>
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title="next chapter">Import project (dialog)</a></p>
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